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An interface is configured on a router for OSPF but the command "show router ospf neighbor" does not show any neighbors. Which of the following is NOT a possible cause?
Correct Answer: A
Comprehensive and Detailed Explanation From Exact Extract: From Nokia 7750 SR OS Routing Protocols Guide (OSPF Neighbor Formation): For a neighbor to show up, the routers must first exchange Hello packets successfully. Area ID mismatch (C), interface down (B), or no Hello received (D) are all valid reasons neighbors won't appear. However, OSPF Database Description (DBD) packets are exchanged only after neighbor adjacency is established. If no neighbor is detected, the DBD packet exchange has not yet started. Thus, correct answer: A.